Waves used for radio transmission have wavelength:
Correct answer: A. Greater than that of infra-red rays
- A. Greater than that of infra-red rays
- B. Smaller than that of infra-red rays
- C. Smaller than that of ultraviolet rays
- D. None of these
Explanation
Radio waves used for transmission have wavelengths greater than infrared (IR) waves and shorter wavelengths than microwaves. In the electromagnetic spectrum, wavelengths increase as you move from higher frequency regions (such as microwaves, infrared, visible light, ultraviolet) to lower frequency regions (like radio waves). Therefore, radio waves, being used for radio transmission, have longer wavelengths compared to infrared waves but shorter wavelengths than microwaves.
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A p-n junction forms when p-type and n-type semiconductor regions meet, creating a depletion layer, barrier potential and rectifying action. The work covers forward and reverse bias, junction current, diode characteristics, and how a diode converts alternating current into pulsating direct current through half-wave and full-wave rectification.
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